A dissection in class is read as taking something apart to understand it, sometimes too coldly. It points to over-analysis, or to a need to look closely at what is usually hidden.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.